WO2015156750A1 - Procédé de production de produits semi-finis métalliques - Google Patents

Procédé de production de produits semi-finis métalliques Download PDF

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Publication number
WO2015156750A1
WO2015156750A1 PCT/UA2014/000044 UA2014000044W WO2015156750A1 WO 2015156750 A1 WO2015156750 A1 WO 2015156750A1 UA 2014000044 W UA2014000044 W UA 2014000044W WO 2015156750 A1 WO2015156750 A1 WO 2015156750A1
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WO
WIPO (PCT)
Prior art keywords
workpiece
semi
finished products
channel
metal
Prior art date
Application number
PCT/UA2014/000044
Other languages
English (en)
Russian (ru)
Inventor
Якив Юхымовыч БЭЙГЭЛЬЗИМЭР
Оксана Викторивна ПРОКОФЬЕВА
Юрий Валэрийович ГУСАР
Дэныс Вячэславовыч ПРЫЛЭПО
Виктор Мыколайовыч ВАРЮХИН
Original Assignee
Донэцькый Физыко-Тэхничный Инстытут Им. Галкина Национальной Акааэмии Наук Украины
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Донэцькый Физыко-Тэхничный Инстытут Им. Галкина Национальной Акааэмии Наук Украины filed Critical Донэцькый Физыко-Тэхничный Инстытут Им. Галкина Национальной Акааэмии Наук Украины
Publication of WO2015156750A1 publication Critical patent/WO2015156750A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/04—Shaping in the rough solely by forging or pressing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon

Definitions

  • the invention relates to the field of metal forming, and in particular to technologies for the preparation of semi-finished metal products with a submicrocrystalline (SMC) structure by intensive plastic deformation methods, and can be used in the manufacture of critical structural elements operating under uniaxial tension conditions.
  • SMC submicrocrystalline
  • the disadvantages of the known methods include the low productivity of the processing process, due to the need for repeated repetition of the processing cycles of the workpiece to achieve the desired result.
  • the semi-finished products obtained by these methods are characterized by a small value of the relative uniform elongation of 5 R. (Korshunov A.I., Smolyakov A.A., Kravchenko T.N., Polyakov L.V. et al. Quality of mechanical properties of metals and alloys after equal channel angular pressing // FTVD.-2008.-T.1 8, K “4.-C.87-95). Large values of this indicator are necessary for semi-finished products intended for the manufacture of structural elements of critical design, operating in uniaxial tension.
  • the value of ⁇ ⁇ is determined in a standard tensile test according to GOST 1497-84. Metals Tensile test methods (interstate standard, Edition: January 2008, FSUE "STANDARTINFORM”)
  • the content of several alternating shifts in one processing cycle of the workpiece increases the degree of grinding of the metal grains and the uniformity of the structure of the resulting semi-finished product for each cycle. As a result, the productivity of the processing process increases, the total number of workpiece processing cycles required to achieve the desired result is reduced.
  • This technical solution is aimed at obtaining metal semi-finished products with a homogeneous QMS structure throughout the volume of the workpiece and, therefore, does not provide the possibility of forming a controlled gradient structure in it. This is ensured by the constancy of the amplitude of alternating shear deformation within the cross section of the workpiece (Segal V.M., Reznikov V.I., Kopylov V.I., Pavlik D.A., Malyshev V.F. Processes plastic structure formation of metals. Minsk: Navuka and technology. - 1994.-232c).
  • Obtained by this method have a semi small value b p characterizing the degree of the uniaxial deformation, which can accumulate until material buckling by necking in the tensile test.
  • the value of ⁇ ⁇ can be up to 50% lower than in metals with micron-sized grains.
  • high values of ⁇ ⁇ are required.
  • the basis of the invention is the task of improving the method for producing metal semi-finished products by forming a controlled gradient structure in the workpiece that provides high ⁇ ⁇ values at high values of strength and ductility, which will make it possible to produce structural elements of critical purpose working under uniaxial tension from semi-finished products.
  • the problem is solved due to the fact that in the method of producing metal semi-finished products, which includes pushing a metal billet through a deforming channel of constant cross section along its axis, forming alternating shear deformations of a given amplitude in the billet, application of backwater from the output side of the deforming channel, according to the invention, is created in deforming channel variable amplitude of shear deformations along the cross section of the workpiece and hold it in the axial region behind cooking in the range from 0 to 0.2.
  • the resulting semi-finished product will have increased strength and plastic characteristics, but small uniform elongation under uniaxial tension ( ⁇ ⁇ ), which is an important parameter in the manufacture of critical components of the resulting semi-finished products, for example, braces in the wings of aircraft, spokes in wheels bicycles, traction in the control systems of various machines, etc.
  • the semifinished product obtained in this case will be a QMS material with a microcrystalline core.
  • the latter under uniaxial tension will prevent the rapid localization of deformation by the formation of a neck.
  • it will provide the semi-finished product with an increased value of uniform elongation of 5 P , in comparison with a homogeneous SMC material, which will be obtained if the condition of holding in the axial region of the amplitude of alternating deformation in the range from 0 to 0.2 is not met.
  • the amplitude of alternating shear alternating deformation can be controlled by changing the shape of the deforming channel, in particular, by twisting the channel of constant cross section around its axis and changing the pitch of the helix obtained.
  • the proposed method is implemented using the device shown in the drawing of FIG. one.
  • FIG. 2 schematically shows a deformation channel.
  • FIG. Figure 3 shows the gradient structure of Grade 4 titanium (data obtained by EBSD analysis) in the initial state, in the axial zone of the deformed workpiece, and in its outer layers.
  • FIG. 4 shows the experimental data in the form of graphs obtained in tensile tests for the initial, QMS and gradient material obtained by the implementation of this method.
  • a device for implementing the method for producing metal semi-finished products includes a punch 1 (see Fig. 1), a container 2, a heater 3, for preheating and maintaining the temperature devices during the pressing process, the upper billet 4, which is designed to press the main billet through the screw section of the deforming channel, the main billet 5, the deformation channel 6, which is the screw section 7, are bounded above and below by straight sections 8 and 9 (see Fig. 2), the lower false blank 10, which is necessary for transferring the back pressure to the main blank at the initial pressing stage, the receiving container 11, the back pressure punch 12.
  • the method of producing metal semi-finished products is implemented as follows.
  • the counter-pressure punch 12 is inserted through the receiving container 1 1 into the straight section 9 of the deforming channel 6.
  • the false blank 10 is pressed into the screw section 7 of the channel 6.
  • the main 5 and the false blank 4 are sequentially loaded into the container 2.
  • the blank is pressed by the punch 1 through the deforming channel 6.
  • the backpressure punch 12 through the lower false blank 10 creates the necessary level of backpressure, of the order of the limit the fluidity of the material of the main billet 5.
  • the upper false billet 4 occupies a position in the screw portion 7 of the deforming channel 6, and the pressed-through main 5 and fac billet 10 are removed from the receiving container I I and, if necessary, repeat the treatment cycle.
  • H a - structure of the initial undeformed workpiece, which is characterized by large grains of the order of hundreds of microns; b - the structure of the axial region of the semi-finished product, which is characterized by grains of the order of tens of microns; c - the structure of the surface layers of the semi-finished product, which has a pronounced SMC character with an average size of the structural element of the order of tenths of a micron. This indicates a gradient structure formed in the obtained semi-finished product with a microcrystalline core and SMC surface layers.
  • FIG. Figure 4 shows the dependences of the conditional stress (F / S 0 ) on the relative elongation (AL / Lo), the so-called tensile diagrams: 1 - a sample of the initial pedeformed titanium Grade 4; 2 - sample with a homogeneous QMS structure; 3 - a sample obtained from a semi-finished product, previously subjected to direct extrusion with a hood 3 to maintain the gradient structure on the sample of a smaller diameter.
  • the initial rectilinear section of the diagrams corresponds to the elastic deformation of the samples, while the nonlinear sections of each of the curves correspond to plastic deformation.
  • the value of the relative uniform elongation of 5 P is determined as the coordinate of the point of intersection with the abscissa axis of the line coming out of the maximum of the tensile diagram at the angle of its elastic section (see dotted lines in figure 4).
  • ⁇ ⁇ for curve 2 is 2%, while for 3 it is 10%. This confirms the increase in uniform elongation, characteristic of the formed gradient structure of the semi-finished product, in comparison with a homogeneous SMC structure.
  • the increased strength characteristics of the obtained gradient semi-finished product which are characteristic of the QMS material, can be judged by the value of the tensile strength - the maximum conditional stress on the tensile diagrams 1, 2, 3 (see Fig. 4).
  • the tensile strength of which is 725 MPa
  • the tensile strength increases to 955 MPa
  • for semi-finished products obtained by the proposed method to 980 MPa.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Forging (AREA)

Abstract

L'invention concerne un procédé de production de produits semi-finis métalliques, se rapporte au domaine du traitement des métaux sous pression, et peut être utilisée pour fabriquer des éléments de construction à vocation correspondante que l'on utilise dans des conditions d'étirement uniaxial. Selon le procédé, on presse l'ébauche métallique dans un canal de déformation à section transversale constante le long de son axe. On forme dans l'ébauche des déformations de décalage de signes alternatifs et d'amplitude donnée. On exerce un support sur le côté de sortie du canal de déformation. Dans le canal de déformation, on applique une amplitude alternante de déformations de décalage selon la section transversale de l'ébauche et on la maintient dans la région proche de l'axe de l'ébauche dans une plage de 0 à 0,2. L'invention permet de former dans l'ébauche une structure en gradient contrôlée qui garantit une valeur δρ élevée lors de valeurs importantes des indices de résistance et de plasticité, et permet de produire à partir de produits semi-finis des éléments de construction à vocation correspondante que l'on utilise dans des conditions d'étirement uniaxial.
PCT/UA2014/000044 2014-04-10 2014-04-23 Procédé de production de produits semi-finis métalliques WO2015156750A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
UA2014003738 2014-04-10
UAA201403738 2014-04-10

Publications (1)

Publication Number Publication Date
WO2015156750A1 true WO2015156750A1 (fr) 2015-10-15

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002102982A (ja) * 2000-09-28 2002-04-09 Mitsui Mining & Smelting Co Ltd 塑性加工装置及び塑性加工方法
KR20020075183A (ko) * 2001-03-23 2002-10-04 김호경 난가공재의 결정립 미세화장치 및 방법
RU2191652C1 (ru) * 2001-04-04 2002-10-27 Глухов Дмитрий Евгеньевич Способ получения заготовок с мелкозернистой структурой
RU2341345C2 (ru) * 2006-04-10 2008-12-20 Институт физико-технических проблем Севера СО РАН Способ комбинированной интенсивной пластической деформации заготовок

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002102982A (ja) * 2000-09-28 2002-04-09 Mitsui Mining & Smelting Co Ltd 塑性加工装置及び塑性加工方法
KR20020075183A (ko) * 2001-03-23 2002-10-04 김호경 난가공재의 결정립 미세화장치 및 방법
RU2191652C1 (ru) * 2001-04-04 2002-10-27 Глухов Дмитрий Евгеньевич Способ получения заготовок с мелкозернистой структурой
RU2341345C2 (ru) * 2006-04-10 2008-12-20 Институт физико-технических проблем Севера СО РАН Способ комбинированной интенсивной пластической деформации заготовок

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